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This PR updates the update-copyright.pl script to also update/add copyright headers to CMake specific files. It further fixes a small typo in the header.
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This is work towards migrating commands to the new API. Internal code that creates command objects just for dumping is replaced with direct calls to functions that print the those commands.
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This makes it so that ExtTheory uses a generic callback instead of relying on Theory.
The primary purpose of this commit is to eliminate the connection of TheoryBV and ExtTheory. This commit moves all things related to ExtTheory in BV into CoreSolver.
It also refactors the use of ExtTheory in strings and arithmetic.
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This deletes much of the old proof code. Basically everything but the minimal necessary infra-structure for producing unsat cores. That includes dependency tracking in preprocessing, the prop engine proof and the unsat core computation code in the old proof manager. These should also go once we fully integrate into master the new proof infrastructure.
It also cleans interfaces that were using old-proof-code-specific constructs (such as LemmaProofRecipe). When possible or when it made sense standalone local proof production code was kept, but deactivated (such is in the equality engine and in the arithmetic solver).
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This is a followup to #4945 which simplifies the contract for computeRelevantTerms.
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This makes it so that equality_engine.h does not include theory.h. This is a bad dependency since Theory contains EqualityEngine.
This dependency between equality engine and theory was due to the use of a helper (Theory::Set) for representing sets of theories that is inlined into Theory. This PR moves this definition and utilities to theory_id.h.
It fixes the resulting include dependencies which are broken by changing the include theory.h -> theory_id.h in equality_engine.h.
This avoids a circular dependency in the includes between Theory -> InferenceManager -> ProofEqualityEngine -> EqualityEngine -> Theory.
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This class is a wrapper around OutputChannel and EqualityEngine. It is preferred that the Theory use this interface when asserting "internal facts" to the equality engine, and for sending lemmas, conflicts and propagations on the output channel.
This class will be useful when trying new methods for theory combination, where all theories behavior can be modified in a standard way based on modifications to the base inference manager class.
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This updates TheoryUF to use the 4 check callbacks instead of implementing check, and uses the official TheoryState object instead of its context::CDO<bool> d_conflict field.
It also makes a minor change to collectModelValues for const and to preNotifyFact to include an isInternal flag.
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Apart from { quantifiers, bool, builtin }, each Theory now has an official equality engine. This PR elaborates on the standard recommended template that Theory should follow, which applies to all theories, regardless of whether they have an equality engine.
This includes:
A standard check method. The Theory is now expected to implement 4 callbacks (preCheck, postCheck, preNotifyFact, notifyFact).
A standard collectModelInfo method. The Theory is now expected to implement 2 callbacks (computeRelevantTerms, collectModelValues).
Additionally, 2 more methods have an obvious default:
(1) getEqualityStatus, which returns information based on an equality engine if it exists,
(2) addSharedTerm, which adds the term as a trigger term to the equality engine of the theory if it exists. Notice that for the sake of more consistent naming, theories now implement notifySharedTerm (previously TheoryEngine called theory-independent addSharedTermInternal which called addSharedTerm, this is updated now to addSharedTerm/notifySharedTerm).
Other methods will not be standardized yet e.g. preRegisterTerm, since they vary per theory.
FYI @barrettcw
Each theory on the branch https://github.com/ajreynol/CVC4/tree/centralEe conforms to this template (e.g. they do not override check or collectModelInfo). The next step will be to pull the new implementation of each Theory from that branch.
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This will be used as a standard way of querying and tracking state information in a Theory. The TheoryState object has a standard role in a number of the new standard templates for Theory:: methods.
The theory state is a collection of 4 Theory members (SAT context, user context, valuation, equality engine), as well as a SAT-context dependent "conflict" flag that indicates whether we have sent a conflict in this SAT conflict. It contains (safe) versions of equality engine queries, which are highly common in many theory solvers.
The next step will be to have the SolverState objects in theory of sets and strings inherit from this class.
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This is work towards a configurable approach to equality engine management. This PR does not change any behavior, it only reorganizes the code.
This PR introduces the standard template for collectModelInfo, which isolates the usage of equality engine in relation to the model. In the future, theories will be encouraged to use the standard template for collectModelInfo and override collectRelevantTerms/collectModelValues only. This is to allow custom theory-independent modifications to building models (e.g. don't assert equality engine to model if we are using a centralized approach).
This PR standardizes TheoryArrays and TheoryDatatypes custom implementation of collectRelevantTerms as work towards using the standard template for collectModelInfo. Notice this required separating two portions of a loop in TheoryArrays::collectModelInfo which was doing two different things (collecting arrays and relevant terms).
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This commit updates Theory so that equality engines are allocated dynamically. The plan is to make this configurable based on the theory combination method.
The fundamental changes include:
- Add `d_equalityEngine` (raw) pointer to Theory, which is the "official" equality engine of the theory.
- Standardize methods for initializing Theory. This is now made more explicit in the documentation in theory.h, and includes a method `finishInitStandalone` for users of Theory that don't have an associated TheoryEngine.
- Refactor TheoryEngine::finishInit, including how Theory is initialized to incorporate the new policy.
- Things related to master equality engine are now specific to EqEngineManagerDistributed and hence can be removed from TheoryEngine. This will be further refactored in forthcoming PRs.
Note that the majority of changes are due to changing `d_equalityEngine.` to `d_equalityEngine->` throughout.
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This includes eliminating TheoryBV's call to eqNotifyNewEqClass and fixing an issue with string's eqNotifyNewEqClass method, which was registering constant integers.
It also removes some unnecessary methods in Theory.
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This is the first step towards making the approach for theory combination in CVC4 configurable.
This PR introduces the "distributed equality engine manager", which encapsulates the current policy that TheoryEngine uses regarding equality engines: each Theory creates a separate copy of an equality engine. The eventual plan is that the official equality engine of Theory is not necessarily unique to the theory, if equality engines are shared. A variant of this class could implement that policy.
This PR does not impact the code, it simply adds the definition of the class. A forthcoming PR will integrate this class into TheoryEngine, which will use dynamic allocation for equality engine objects.
FYI @barrettcw
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Previously, we assumed that ExtTheory, the module for doing context-dependent simplification, was one-to-one with Theory. This design is not necessary. This makes this class a utility, which can be used as needed. This makes e.g. the initialization of TheoryStrings much easier, since the ExtTheory object can be created first.
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The generality of this interface is unnecessary.
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This includes 4 changes:
Theory constructor takes a ProofNodeManager,
Theory::explain returns a TrustNode (of kind PROP_EXP),
Theory::expandDefinitions returns a TrustNode (of kind REWRITE),
Theory::ppRewrite returns a TrustNode (of kind REWRITE).
These are all currently planned updates to the interface of Theory.
This PR also connects some of the existing proof rule checkers into the proof checker, if one is provided to the constructor. It updates TheoryEngine and other places to process TrustNode in trivial ways (converting them into Node). These calls will later be updated as needed for proof support.
This PR is also contingent on the performance tests for proof-new on SMT-LIB.
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When we eliminate a variable x -> v during simplification, it may be the case that v contains "unevaluated" operators like forall, choice, etc. Thus, we do not produce correct models for such inputs unless simplification is disabled.
This PR ensures we only eliminate variables when v contains only evaluated operators.
Additionally, the kinds registered as unevaluated were slightly modified so that when we are in a logic like QF_LIA, there are no registered unevaluated operators, hence the check above is unnecessary. This is to minimize the performance impact of this change.
Fixes #4500.
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Fixes #3971 and fixes #3991. In incremental mode, the logic can change from one
(check-sat) call to another. In the reported issue, we start with QF_NIA
but then switch to QF_UFNIA because there is a div term (which has a UF in
its expanded form). Dealing with this issue is challenging in general. As a
result, we have decided not to allow theory widening in
Theory::expandDefinitions() anymore but instead to do it eagerly in
SmtEngine::setDefaults().
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This commit adds statistics for string rewrites. This is work towards proof
support in the string solver. At a high level, this commit adds a pointer to a
`SequenceStatistics` in the rewriters and modifies
`SequencesRewriter::returnRewrite()` to count the rewrites done. In practice,
to make this work requires a couple of changes, some of them temporary:
- We can't have a single `Rewriter` instance shared between different
`SmtEngine` instances anymore. Thus the `Rewriter` is now owned by the
`SmtEngine` and calling the rewriter retrieves the rewriter associated with
the current `SmtEngine`. This is a temporary workaround before we get rid of
singletons.
- Methods in the `SequencesRewriter` and the `StringsRewriter` are made
non-`static` because they need access to the statistics instance.
- `StringsEntail` now has non-`static` methods because it needs a reference to
the sequences rewriter that it can call.
- The interaction between the `StringsRewriter` and the `SequencesRewriter`
changed: the `StringsRewriter` is now a proper `TheoryRewriter` that inherits
from `SequencesRewriter` and calls its `postRewrite()` before applying its
own rewrites (this is essentially a reversal of roles from before: the
`SequencesRewriter` used to call `static` methods in the `StringsRewriter`).
- The theory rewriters are now owned by the individual theories. This design
mirrors the `EqualityEngine`s owned by the individual theories.
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Until now, the `Rewriter` was responsible for creating `TheoryRewriter`
instances. This commit adds a method `mkTheoryRewriter()` that theories
override to create an instance of their corresponding theory rewriter.
The advantage is that the theories can pass additional information to
their theory rewriter (e.g. a statistics object).
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This commit adds support for code generation of options with modes (enums). From now on option enums can be specified in the corresponding *.toml files without the need of extra code. All option enums are now in the options namespace.
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Fixes #2517.
This makes the order of theories explicit in the source code rather than relying on the order defined via the build system. Previously, the build system ensured the order of the theories via the KINDS_FILES variable, which is a list of kinds files that is fed to code generation scripts (mkkind, mkmetakind, mkrewriter, mktheorytraits). The generated code critical to the order of theories w.r.t. soundess is the TheoryId enum, and the CVC4_FOR_EACH_THEORY macro. Ideally, we would want to get rid of the latter (ugly and error prone), which is not possible in the current configuration, and to be discussed in the future.
This PR moves the TheoryID enum and related functions to theory/theory_id.h, and the CVC4_FOR_EACH_THEORY macro to theory/theory_engine.cpp, the only place where it is used.
I ran it on whole SMT-LIB (non-incremental and incremental) and did not encounter any soundness issues. The only issue that did occur is not related to these changes, non-critical and known: #2993
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Fixes 2887.
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C++11 supports explicitly deleting functions that should not be used
(explictly or implictly), e.g. copy or assignment constructors. We were
previously using the CVC4_UNDEFINED macro that used a compiler-specific
attribute. The C++11 feature should be more portable.
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* Fixes --hide-zero-stats (and really skips the 0 values)
* Removes the additional newline after each statistic
* Introduces theory::getStatsPrefix(TheoryId) to generate consistent
prefixes for statistics based on the theory id
(e.g., THEORY_BV -> "theory::bv").
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Removing more miscellaneous throw specifiers. Also fixing the spelling of amount in several places.
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* Document TermDb and related classes. Minor changes to quantifiers utils and their interface. Address some comments left over from PR 1206.
* Minor
* Minor
* Change namespace style.
* Address review
* Fix incorrectly merged portion that led to regression failures.
* New clang format, fully document relevant domain.
* Clang format again.
* Minor
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* Ensure that expand definitions is called on all non-variable expressions. In particular, it is necessary that the sets theory is notified when a set universe term occurs in the input to ensure options are set correctly. The commit moves this check from within check() to expandDefinitions(), and also adds the check for join image which relies on universe set. This fixes a bug reported by Arjun. Add and update regressions.
* Add comments concerning expandDefinitions
* Expand comment, move to .h
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* Replacing __gnu_cxx::hash_map with std::unordered_map.
* Replacing __gnu_cxx::hash_set with std::unordered_set.
* Replacing __gnu_cxx::hash with std::hash.
* Adding missing includes.
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Disable support for subrange and predicate subtypes (which were only partially supported previously).
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argument.
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commit for nlAlgMaster.
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